CN1090723C - Hydraulic coupling - Google Patents

Abstract

The present invention relates to a flow-controlled fluid coupling comprising a working chamber (5.2) formed by a pump wheel (3.2) and a turbine wheel (4.2) for introducing a working medium. In order to enable the working chamber to be completely filled at a slip ratio of 100% even when transmitting a large torque, the present invention proposes that an inlet (3.2.1) for introducing the working medium into the working chamber (5.2) is positioned at a point as radially outward as possible in the working chamber (5.2).

Description

Hydraulic coupling

technical field

The invention relates to a fluid coupling having a pump wheel and a turbine wheel which together form an annular working chamber. The working chamber is used to accommodate the working medium for transmitting torque, such as oil or water.

Background technique

There are fluid couplings that are continuously filled with working medium - also known as quantitative fluid couplings. However, there are also turbo couplings whose working chamber can be filled and emptied in a controlled manner - also known as flow-controlled and fill-controlled turbo couplings. The present invention relates to a coupler of the type described hereinafter. Such a coupler is known from DE 197 06 652 A1.

Fluid couplings are used to transmit torque from a drive motor to a working machine, for example from an electric motor to a grinding machine, or to conveying equipment. Depending on the operating characteristics of such a coupling, the torque is transmitted from the motor to the working machine in a very flexible manner. Especially at start-up, ie when the motor is rotating and the working machine is stationary, the torque curve transmitted to the working machine rises only slowly. If the drive motor is an electric motor, the latter rotates to its rated speed under no load.

Fluid couplings for flow control are especially used in the mining industry. In these cases, for example, they are connected between the motor and the conveyor belt. An important application in this regard is the so-called chain-cleaning conveyor belt. Here too, the coupling is used to ensure a smooth transmission of torque, not only during the start-up phase, but also when the cleaning belt is running, ie when particularly hard materials are encountered during operation of the cleaning belt.

Motors were further developed during this period. The overturning moment of the motor increases. However, conventional designs of couplings are not able to provide this increased tilting moment and therefore cannot transmit a sufficient amount of torque from the motor to the working machine.

Contents of the invention

The present invention is based on the object of referring to a drive device with a motor and a flow-controlled fluid coupling in such a way that sufficient torque is transmitted from the motor to the working machine.

This object is achieved by the features of claim 1 . The inventors have found in particular that with the stated slip ratio of 100%, the working chamber is not filled to the necessary degree. Rather, only partial filling is achieved.

The inventors have also found that the reason for this is that the working medium is delivered to the coupling working chamber on a relatively small radius in the currently known fluid couplings with flow control. As long as the working chamber is still empty, the delivery of the working medium to the working chamber is no problem. However, as the degree of filling increases, a dynamic pressure is generated in the working chamber. This dynamic pressure counteracts the pressure of the conveyed medium and increasingly hinders the further inflow of working medium, so that the working chamber is never completely filled. However, the farther radially outward the inlet of the working medium into the working chamber is arranged, the greater the rotational pressure of the inflowing working medium. The greater rotational pressure can overcome the fluid pressure in the working chamber. This makes it possible to completely fill the working chamber and thus to transmit a sufficient torque from the motor to the working machine, for example to the aforementioned chain-cleaning conveyor belt.

The inlet does not necessarily have to be on the largest radius, ie at the apex of the working chamber. It should however be located in the region of the apex of the working chamber.

For example, with the flow-controlled fluid coupling structure according to the present invention, the chain-cleaning conveyor belt is not a problem to start even when a large amount of coal falls into its collection area.

Description of drawings

The present invention and prior art will be described in detail with reference to the drawings. Specifically, the following is shown:

FIG. 1 shows an axial section through a flow-controlled fluid coupling according to the invention.

FIG. 2 shows an axial section through a flow-controlled fluid coupling according to the prior art.

Detailed ways

The coupler shown in Figure 1 is a duplex structure.

The coupling has a drive shaft 1 and a driven shaft 2 . The drive shaft 1 is connected to the first pump wheel 3.1 in a non-rotatable manner, and is also connected to the second pump wheel 3.2 through a cylindrical cavity wall 6 . The second pump wheel 3.2 is connected to the cylindrical chamber wall 6 in a non-rotatable manner.

The output shaft 2 has a first turbine 4.1 and a second turbine 4.2.

The pairs of impellers 3.1, 4.1 and 3.2, 4.2 together form corresponding working chambers 5.1, 5.2.

These said rotating parts are surrounded by a housing 7 . The housing has a housing inlet 7.1 and a housing outlet 7.2 for the working medium. The working medium can be, for example, water or oil.

A so-called coupling bushing 8 is connected to the pump wheel 3.2 in a non-rotatable manner. Together with the pump wheel 3.2, the coupling bush forms a flow channel 9.

The key to the invention is hole 3.2.1. This hole creates a guiding connection between the flow channel 9 and the working chamber 5.2. The bore 3.2.1 can run parallel to the axis of the machine or obliquely relative to the axis of the machine. In addition, it can also be designed as a downstream nozzle.

The pump wheel 3.1 is equipped with an outlet valve 3.1.1.

The working medium is delivered to the coupler by an outer loop (not shown here). This circuit includes coolers, regulators and other known packages in a known manner.

The working medium is introduced into the housing via the housing inlet 7.1. The working medium then flows radially inwards within the housing almost as far as the output shaft 2 . From there it enters the flow channel 9, passes through the transverse hole 3.2.1 into the working chamber 5.2, from there enters the working chamber 5.1, and from there flows through the valve 3.1.1 to the housing outlet 7.2.

The configuration of the transverse bores in the radially outer region of the working chamber 5.2—here in the region of the apex of the working chamber—enables the working chamber 5.2 and also the working chamber 5.1 to be completely filled with working medium.

The embodiment of the known flow-controlled fluid coupling shown in FIG. 2 is also a duplex-coupling. It differs substantially from the coupling according to the invention in that the inlet 3.2.1 into the working chamber 5.2 is situated on a very small radius. In this case, it is impossible or very difficult for the working chambers 5.2, 5.1 to be completely filled with the working medium when the slip ratio is 100% and the load is large.

Claims (4)

1. the fluid coupling of a flow control:

Have pump impeller (3.1,3.2);

Have turbine (4.1,4.2);

Have the live axle (1) that is connected to rotate means of fixation with pump impeller (3.1,3.2);

Have the driven shaft (2) that is connected to rotate means of fixation with turbine (4.1,4.2);

Pump impeller (3.1,3.2) and turbine (4.1,4.2) form annular working chamber (5.1,5.2) together;

Active chamber (5.1,5.2) is right after on the external loop-around of working medium, and has the inlet (3.2.1) that is used for working medium is introduced active chamber (5.2);

Comprise following feature:

Be provided with the housing (7) of the rotary component that surrounds coupler, and housing have housing inlet (7.1) and the housing outlet (7.2) that is used for working medium.

Inlet (3.2.1) is positioned at the maximum radius zone of active chamber (5.2).

2. coupler as claimed in claim 1 comprises following feature:

Coupler lining (8) is connected with pump impeller (3.2) not relatively rotate mode, and is in the back side of pump impeller (3.2);

Between coupler lining (8) and pump impeller (3.2), form flow channel (9);

Inlet (3.2.1) is set up guiding and is connected between the downstream of flow channel (9) and active chamber (5.2).

3. coupler as claimed in claim 1 or 2 comprises following feature:

In the duplex structure, be provided with two pump impellers (3.1,3.2) and two turbines (4.1,4.2), therefore formed the sub-coupler that respectively has an active chamber (5.1,5.2);

Coupler lining (8), flow channel (9) and the inlet (3.2.1) that is used to import working medium are assigned near the sub-coupler that is positioned at the driven shaft (2).

4. coupler as claimed in claim 3 is characterized in that, housing inlet (7.1) is arranged near residing that axial region of sub-coupler the driven shaft basically.

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